import { Component } from '@angular/core';
import { Platform,ToastController} from 'ionic-angular';
import { StatusBar } from '@ionic-native/status-bar';
import { SplashScreen } from '@ionic-native/splash-screen';


import { TabsPage } from '../pages/tabs/tabs';
import { WelcomePage } from '../pages/welcome/welcome';
@Component({
  templateUrl: 'app.html'
})
export class MyApp {
  // rootPage:any = TabsPage;
  rootPage:any;
  public static backButtonPressedOnceToExit = false;  


  constructor(
    platform: Platform, 
    statusBar: StatusBar, 
    splashScreen: SplashScreen,
    public toastCtrl:ToastController) {
   
   // 如果用户是第一次启动，就跳转到欢迎界面。不是就直接进入首页
    let result = localStorage.getItem('firstIn');
      if(result){ 
        this.rootPage = TabsPage; 
      }else{
        localStorage.setItem('firstIn', "yes");
        this.rootPage = WelcomePage;
        }

    platform.ready().then(() => {
      // Okay, so the platform is ready and our plugins are available.
      // Here you can do any higher level native things you might need.
      statusBar.styleDefault();
      splashScreen.hide();
    });
    platform.registerBackButtonAction(function(e){  
      if(MyApp.backButtonPressedOnceToExit){  
        platform.exitApp();  
      }else{  
        MyApp.backButtonPressedOnceToExit = true;  
        let toast = toastCtrl.create({  
          message: '再按一次退出',  
          duration: 2000,  
          position: 'bottom'  
        });  
        toast.present();  
        setTimeout(function(){  
          MyApp.backButtonPressedOnceToExit = false;  
        },2000)  
      }  
    },101) 
  }
}
